Luke 18:31

Here is, I. The notice Christ gave to his disciples of his sufferings and death approaching, and of the glorious issue of them, which he himself had a perfect sight and foreknowledge of, and thought it necessary to give them warning of, that it might be the less surprise and terror to them. Two things here are which we had not in the other evangelists: - 1. The sufferings of Christ are here spoken of as the fulfilling of the scriptures, with which consideration Christ reconciled himself to them, and would reconcile them: All things that are written by the prophets concerning the Son of man, especially the hardships he should undergo, shall be accomplished. Note, The Spirit of Christ, in the Old Testament prophets, testified beforehand his sufferings, and the glory that should follow, Pe1 1:11. This proves that the scriptures are the word of God, for they had their exact and full accomplishment; and that Jesus Christ was sent of God, for they had their accomplishment in him; this was he that should come, for whatever was foretold concerning the Messiah was verified in him; and he would submit to any thing for the fulfilling of scripture, that not one jot or tittle of that should fall to the ground. This makes the offence of the cross to cease, and puts an honour upon it. Thus it was written, and thus it behoved Christ to suffer, thus it became him. 2.

— Matthew Henry's Concise Commentary (public domain)

FULLER ANNOUNCEMENT OF HIS APPROACHING DEATH AND RESURRECTION. (Luk 18:31-34) all written by the prophets concerning the Son of man . . . be accomplished--showing how Christ Himself read, and would have us to read, the Old Testament, in which some otherwise evangelical interpreters find no prophecies, or virtually none, of the sufferings of the Son of man.

— Jamieson-Fausset-Brown Commentary (public domain)